Oxygen Sensor: Description and Operation

The purpose of this system is to maintain a controlled air/fuel ratio, allowing the catalyst to reduce oxide of nitrogen, hydrocarbons, carbon monoxide and to improve fuel economy simultaneously.
The ECM and the oxygen sensor are parts of the feedback system. The oxygen sensor mounted on the exhaust manifold monitors the exhaust gas air/fuel ratio and sends signals to the ECM. The ECM processes the oxygen sensor signal and controls the air/fuel ratio by varying the injector operation time. The signal from the exhaust gas air/fuel ratio sensed by the oxygen sensor is sent to the ECM and the air/fuel ratio is controlled.